Process bioengineering applied to BTEX degradation in microaerobic treatment systems.
J Environ Manage
; 223: 426-432, 2018 Oct 01.
Article
em En
| MEDLINE
| ID: mdl-29957416
The effect of different microaeration flow rates and dosing points, and of effluent recirculation, on microaerobic BTEX degradation in an anaerobic bioreactor was assessed. Additionally, a sensitivity and recovery analysis for this system was performed during microaeration failure simulations. Under anaerobic conditions, BTEX removal efficiencies between 55 and 82% were achieved depending on the compound, being benzene the most recalcitrant one. Microaeration (0.5-2.0â¯mL air min-1) ensured high removal efficiencies (>83%) for all compounds, and the best results were obtained for the flow rate of 1.0â¯mL air min-1, particularly for benzene, with a 30% increase in its removal efficiency. Effluent recirculation showed to be an important factor to improve mass transfer and, consequently, BTEX removal. Volatilization was negligible even under microaerobic conditions, suggesting that microbial activity was the main removal mechanism. Finally, after microaeration shutdown periods, the bioreactor could recover its prior performance within up to 2 days.
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Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Derivados de Benzeno
/
Reatores Biológicos
/
Bioengenharia
Idioma:
En
Revista:
J Environ Manage
Ano de publicação:
2018
Tipo de documento:
Article
País de afiliação:
Brasil
País de publicação:
Reino Unido